Witsch



Dec. 22, 1925- 1,566,902

1 z. clFFRlNoWlTscl-l INDUC PION METER Filed OC. 16, 1922 F7 I F722.

Inventor? Zalman n CiH'r-nowitsch,

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Patented Dec. 22, 1925.

4ZAJI'JMIAIII-i' CIFFRINOWITSCH, OF BERLIN, Olm, ABBIGNOB TO GENERAL ELECTRIC A CORPORATION OI' NEW YORK IIDUCTION m38.

Application led October 16, 1.28; Serial; Ho. 594,752.

To all whom t may concern.'

Be it known that I, ZALMANN CIFFRINO- wrrscH, a citizen of Russia residing at Berlin, Germany, have invented certain new and i useful Improvements in Induction Meters, of which the following is a specification.

VMy invention relates to induction meters and more in particular to means for obtaining the'desired phase angular relation bel@ tween the current and voltage uxes.

It is well known that in an induction type watt meter the iiuxes produced by the voltage and current coils are made to differ 90 deg. in time phase from each other at unity 16 power factor, whereas, in the reactive cornonent meter, the two fluxes are arranged to e in phase at unity power factor in which condition no rotative torque is produced. As the power factor varies from unity the two 20 fluxes differ in time phase to produce a torque equal to EJ sin y, where o is the phase angle between current and voltage.

The primary object of my invention is to provide a meter of the latter class in which the correct angular relation between the current and voltage fluxes is easily and eiiiciently obtained and which permits this angular relation to be readil adjusted after the meter parts are assem led. In carrying my invention into eiect, I provide one or more adjustable magnetic shunts for causing an articial dispersion of the magnetic iiux created by the current and voltage coils. the features of my invention which I bepointed out in the claims appended hereto. lhe preferred construction and the theory of operation of a reactive component meter built in accordance with my invention will now be explained in connection with the accompanying drawings in which Fig. l represents a side view of the essential parts of a singlephase meter to which my inventlon is applied; Fig. 2 shows a view taken at right angles to Fig. 1 and Fig. 3 is a vector dia am descriptive of the flux relations of my 1mproved meter.

Referring to the drawings, the magnet body a of my improved meter is preferably constructed with three legs. The current coils b are situated on the outer legs of the magnet bod a and are located to advantage near the yoke of the magnet body, that 1s, aq far as possible from the air gap and the lieve to be novel and patentable will bev actuating disc al. The voltage coil is dispgsed on the middle core of the magnet dy apreferablv near the air ga or actuatin dlsc. On the leg carrying t e voltage Wm ng 1s fixed a ma etic shunt f which is made of solid or sllghtly laminated iron and which, if desired, carries a short circuit- 1n ring g. By this means the magnetic he d created by the voltage coil c 1s divided into vtwo effective parts. One part runs in the usual manner from the middle leg through the actuating disc d, through the cooperatmg magnetic member e and then through the outer legs of the magnet body a. 'lhe second part of the field runs through the actuating disc d and the magnetic shunt In ig. 3 it may be assumed that the current to be metered has no reactive component, that is, the voltage E and the current J are 1n phase as represented by the vectors E and J. The voltage E creates in thevoltage coil a magnetic flux which is d1v1ded into two parts,.F1 and F2. The magnetic teld F1, which starts from the m1 dole leg of the magnet body, lags by a certaln angle in consequence of the self induction of the voltage coil. The magnetic tield which flows through the shunt f has a direction lll"2 in consequence of the magnetic leakage of the shunt and of the short clrcuiting ring g thereon. The two lields F7 and F2 form the resultant or effective field FE. In consequence of the leakage of the outer legs of the magnet which project some distance beyond the current coil, the magnetic field created by the current in the current coil Z; lags in phase and assumes a direction re resented by the vector Fh. The leaka e ofp the outer legs of the magnet body may e supplemented by placing short circuiting rings thereon, which if desired, may be ad]ustable.

By the correct proportion of the various flux shifting means above mentioned, and especially by the proportioning of the shunt f, the short circuiting ring g, thelength of the outer legs of the driving core and the leakage between the current coils and the voltage coil, the fields F., and Fh can be made to have practically the same vector direction such as illustrated at unity power factor and any phase angle still existing between these two vectors may be eliminated by shiftin the short circuiting ring g located on t e shunt f or the short circuiting .rings located on the outer legs of the core.

While I have described my invention as applied to a reactive com onent meter, I do not wish to be limited t ereto because it will 'be evident to those skilled in the art that the means described may be utilized within certain limits to obtain other desired phase angular relations between the current and voltage fluxes in an induction type meter.

What I claim as new and desire to secure by Letters Patent of the United States, is

1. An induction disc meter of the three leg ed type having a potential coil on the midle leg and current coils on the outer l legs, characterized by the fact that the potential coil is positioned closely adjacent the meter disc and is provided with means for shunting a portion .of its effective flux, and by the fact that the current coils are positioned asuilicient distance from the meter disc as to allow a considerable leakage of 85 the ilux produced thereby.

2. A reactive component induction disc meter .of the three legged type having a potential coil on the middle leg and current coils on the outer legs, characterized by the fact that said coils are considerabl shorter than said legs, the potential coil being closev ly adjacent the meter disc and the current coils a considerable distance therefrom and by the fact that said middle leg is provided with an adjustable auxiliary magnetic shunt.

3. An induction disc meter of the three legged tlype having a potential-coil on the m1 dle eg and current coils on the outer legs, said legs being considerably longer than said coils and said potential coil bein arranged nearer the meter disc than sai current coils, a magnetic shunt for said mid- 

